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Old 10-06-2015, 06:36 AM   #1
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hammering water pump

My water pump hammers like a machine gun when faucets or shower are turned on to a certain flow or level. It even makes the lights flicker in the coach. Is it a sign that it is going bad? I put a new filter in and cleaned the strainer on the pump as well as the screens on the faucets and no change.
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Old 10-06-2015, 08:39 AM   #2
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Get an air/bladder tank and add it.

It acts as anti hammer and makes it operate Loke an air compressor.

They are easy to install and not expensive.

Ours has large one behind cabinets.
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Old 10-06-2015, 08:55 AM   #3
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I went to Lowe's and picked up a "water heater" expansion tank. Not the one for a boiler.

I found a spot in the line under the sink and cut it, installed a "Shark Bite" push fitting Tee and a short piece of PEX line to a "Shark Bite fitting on the tank. All 1/2".

Much better water system, with no hammering.
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Old 10-06-2015, 09:02 AM   #4
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Quote:
Originally Posted by mojoracing View Post
My water pump hammers like a machine gun when faucets or shower are turned on to a certain flow or level. It even makes the lights flicker in the coach. Is it a sign that it is going bad? I put a new filter in and cleaned the strainer on the pump as well as the screens on the faucets and no change.

This is what you need.
Amazon.com: Shurflo Accumulator Tank 181-201: Industrial & Scientific
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Old 10-06-2015, 09:09 AM   #5
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I had the same problem with the bathroom sink. The filter on the end of the faucet was the cause. Never would have guessed that at the start.


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Old 10-06-2015, 11:02 AM   #6
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I added an accumulator, and while I like what it does, adding hoses at the pump did more to quiet it down than the accumulator.

Camping World sells a Shurflo kit, I just bought some hose at Lowes.

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Old 10-07-2015, 12:23 AM   #7
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Maybe I'm not explaining it right. When it runs continuously, it is very quite. It's like it turns on and off, several times per second. Perhaps cavitation? It just started doing it after two years of no problems.
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Old 10-07-2015, 05:04 AM   #8
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I believe the water heater leaves an air space that absorbs the hammer effect.

Try running the system empty and refilling. It would cure my problem for a while.

Being full time, I wanted a better fix.
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Old 10-07-2015, 05:16 AM   #9
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Sounds like your water heater needs the air chamber refreshed. shut off all water supply, pump and shore.
Drain water heater and open relief valve. close both valves when water stops draining. Turn pump or shore water back on.
This is a common problem.
An extra tank does work better but not a must have.
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Old 10-07-2015, 05:24 AM   #10
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good call twinboat

I saw your post after I put mine up, I take too long to type it up.

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Old 10-12-2015, 10:43 PM   #11
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Thanks for the replies. Sorry wasn't watching threads for a few days. You guys are probably right and I knew about the air space in the water heater but didn't think about it. The coach has had continuous water in it for almost a year so your right, the air space has probably went away. I will try it and report back.
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